Utah mammals

Dwarf Shrew in Utah

Sorex nanus

Native to Utah S3 Vulnerable in Utah

Not listed as nonindigenous in Utah by USGS NAS; native to its Utah range.

IUCN Red List status

  1. LC
  2. NT
  3. VU
  4. EN
  5. CR
  6. EW
  7. EX

LC – Least Concern

Widespread and abundant; not at risk.

Dwarf Shrew in Utah, by the numbers

Rare in Utah 105th most recorded of 141 mammals logged in Utah

30 occurrence records

Records from 2000–2026.

When to look for the Dwarf Shrew in Utah

Most sightings fall in July to August.

30 Utah occurrence records (iNaturalist and GBIF) by month of year, 2000–2026. Shows when the species is recorded, not a guarantee of presence.

Monthly Utah records (table)
MonthRecords
January0
February0
March0
April0
May1
June2
July12
August10
September4
October0
November0
December1

Monthly dwarf shrew occurrence records (iNaturalist and GBIF) in Utah, 2000–2026.

Seasonality

Year-round in Utah, with recorded sightings peaking in July–August.

Occurrence map

Where Dwarf Shrew has been recorded in Utah

30 records mapped · zoom and drag to explore

30 Utah records mapped

Notable places to look

Park, forest, or monumentiNaturalist records
Bryce Canyon National Park 3
Utah State Department of Wildlife Resources 116 2

Protected places with the most dwarf shrew sightings, from the USGS Protected Areas Database plus named mountain ranges, good spots to look, not a full breakdown, so they don't sum to the total.

Where it's recorded in Utah

CountyRecords
Garfield County 10
San Juan County 8
Summit County 2
Grand County 2
Uintah County 2
Kane County 2
Sevier County 1
Wayne County 1
Duchesne County 1
Emery County 1

The complete county distribution, spread across 10 Utah counties. Every occurrence record falls in one county, so these sum to the total. Counties from GBIF and US Census boundaries.

Dwarf shrews in Utah turn up in the high, cool country of the Uinta Mountains and Wasatch Range, especially within Ashley National Forest, habitat that matches this shrew’s preference for damp alpine meadows and subalpine forest floor. At barely a tenth of an ounce, it’s one of the smallest mammals in North America and needs moist, insect-rich ground litter to survive; suitable pockets aren’t continuous across the mountains.

All 30 of Utah’s records come from GBIF trapping data, none from iNaturalist, since an animal this small and secretive is almost never found by casual observers. Reports peak in July and August, when high-elevation field surveys are easiest to run, not necessarily when shrews are most active. NatureServe ranks it S3, vulnerable, in Utah, reflecting how few confirmed sites exist for this specialist.

Occurrence data from GBIF.

More mammals in Utah in the atlas

Data & sources

The data and visualizations on this page draw on these open sources:

  • GBIFCC-BY 4.0occurrence records behind the range map, elevation, and record counts
  • iNaturalistCC0 / CC-BY / CC-BY-SAobservations, photos, and audio recordings
  • NatureServe ExplorerCC-BYthe state conservation rank
  • IUCN Red Listattributed factthe global conservation status
  • USGS NASpublic domainnative / introduced status
  • Natural Earthpublic domainthe relief basemap
  • USFSpublic domainnational-forest boundaries
  • USGS Protected Areas Databasepublic domainthe named parks, forests, and refuges behind "notable places to look"